Study on fatigue reliability evaluation method of mechanical system with damage structure under variable amplitude load

2018 ◽  
Vol 7 (2) ◽  
pp. 150
Author(s):  
Xiaohang Xiong ◽  
Liyang Xie ◽  
Yuanyuan Ma
Keyword(s):  
Mechanical System ◽  
Evaluation Method ◽  
Reliability Evaluation ◽  
Fatigue Reliability ◽  
Variable Amplitude ◽  
Damage Structure ◽  
Variable Amplitude Load

A Time-Variant Reliability Evaluation Method on Fatigue of Riser System

2010 ◽  
Author(s):  
Hai Sun ◽  
Liping Sun ◽  
Wei Dai
Keyword(s):  
Production System ◽  
Evaluation Method ◽  
Failure Modes ◽  
Reliability Evaluation ◽  
Fatigue Reliability ◽  
Integrity Assessment ◽  
Offshore Production ◽  
Main Factors

Riser has been and will be an important part of the offshore production system. Due to the complexity of environment, reliability evaluation is needed for the riser system to ensure the safety and durability. The analysis of the failure modes of riser system was studied in this article, firstly, the main factors of which may lead to failure of riser system were analyzed and classified; secondly, a time-variant reliability evaluation method was proposed to calculate fatigue reliability of riser system; finally, riser fatigue reliability of a certain FPSO is calculated by the proposed method, the results showed that time-variant reliability can better externalize safety of riser during structural service. The proposed method of this paper was significance in safety and integrity assessment of riser system.

Study on the Fatigue Reliability Model Based on Probability Distribution of Fatigue Life under Spectrum Loading

2010 ◽  
Vol 44-47 ◽  
pp. 2788-2792
Author(s):  
Ying Wu ◽  
Li Yang Xie
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Probability Distribution ◽  
Life Cycles ◽  
Reliability Model ◽  
Fatigue Reliability ◽  
Load History ◽  
Life Distribution ◽  
Variable Amplitude ◽  
Variable Amplitude Load

Under variable amplitude load history the exact distribution of fatigue strength corresponding to a specified number of life cycles cannot be obtained exactly by test, fatigue strength distribution can be obtained from fatigue life distribution. According to statistical property analysis of Miner cumulative damage rule, probability distribution of fatigue life under variable amplitude load history is predicted based-on constant amplitude median Sa-Sm-N surface. In the end, a fatigue reliability model is established to calculate fatigue reliability according to stress distribution as well as fatigue life distribution function. The model is applicable to calculate fatigue reliability under stochastic load environments.

Robust Test Method of TSOP PEMs for Space Application

2019 ◽  
Author(s):  
Yasunobu Iwai ◽  
Koichi Shinozaki ◽  
Daiki Tanaka
Keyword(s):  
Evaluation Method ◽  
Low Cost ◽  
Reliability Evaluation ◽  
Test Method ◽  
Thermal Shock Test ◽  
Space Application ◽  
Space Applications ◽  
Limit Test ◽  
Long Time ◽  
Short Time

Abstract Compared with space parts, consumer parts are highly functional, low cost, compact and lightweight. Therefore, their increased usage in space applications is expected. Prior testing and evaluation on space applicability are necessary because consumer parts do not have quality guarantees for space application [1]. However, in the conventional reliability evaluation method, the test takes a long time, and the problem is that the robustness of the target sample can’t be evaluated in a short time. In this report, we apply to the latest TSOP PEM (Thin Small Outline Package Plastic Encapsulated Microcircuit) an evaluation method that combines preconditioning and HALT (Highly Accelerated Limit Test), which is a test method that causes failures in a short time under very severe environmental conditions. We show that this method can evaluate the robustness of TSOP PEMs including solder connections in a short time. In addition, the validity of this evaluation method for TSOP PEM is shown by comparing with the evaluation results of thermal shock test and life test, which are conventional reliability evaluation methods.

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